1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 package jdk.tools.jaotc.jnilibelf;
  25 
  26 import java.nio.ByteOrder;
  27 
  28 import jdk.tools.jaotc.jnilibelf.JNILibELFAPI.ELF;
  29 
  30 /**
  31  * Class that abstracts ELF target details.
  32  *
  33  */
  34 public class JNIELFTargetInfo {
  35     /**
  36      * ELF Class of the target.
  37      */
  38     private static final int elfClass;
  39     /**
  40      * Target architecture.
  41      */
  42     private static final int arch;
  43     /**
  44      * Architecture endian-ness.
  45      */
  46     private static final int endian;
  47 
  48     /**
  49      * Target OS string.
  50      */
  51     private static final String osName;
  52 
  53     static {
  54         // Find the target arch details
  55         String archStr = System.getProperty("os.arch").toLowerCase();
  56         String datamodelStr = System.getProperty("sun.arch.data.model");
  57 
  58         if (datamodelStr.equals("32")) {
  59             elfClass = ELF.ELFCLASS32;
  60         } else if (datamodelStr.equals("64")) {
  61             elfClass = ELF.ELFCLASS64;
  62         } else {
  63             System.out.println("Failed to discover ELF class!");
  64             elfClass = ELF.ELFCLASSNONE;
  65         }
  66 
  67         ByteOrder bo = ByteOrder.nativeOrder();
  68         if (bo == ByteOrder.LITTLE_ENDIAN) {
  69             endian = ELF.ELFDATA2LSB;
  70         } else if (bo == ByteOrder.BIG_ENDIAN) {
  71             endian = ELF.ELFDATA2MSB;
  72         } else {
  73             System.out.println("Failed to discover endian-ness!");
  74             endian = ELF.ELFDATANONE;
  75         }
  76 
  77         if (archStr.equals("x86")) {
  78             arch = ELF.EM_386;
  79         } else if (archStr.equals("amd64") || archStr.equals("x86_64")) {
  80             arch = ELF.EM_X64_64;
  81         } else if (archStr.equals("sparcv9")) {
  82             arch = ELF.EM_SPARCV9;
  83         } else {
  84             System.out.println("Unsupported architecture " + archStr);
  85             arch = ELF.EM_NONE;
  86         }
  87 
  88         osName = System.getProperty("os.name").toLowerCase();
  89     }
  90 
  91     public static int getELFArch() {
  92         return arch;
  93     }
  94 
  95     public static int getELFClass() {
  96         return elfClass;
  97     }
  98 
  99     public static int getELFEndian() {
 100         return endian;
 101     }
 102 
 103     public static String getOsName() {
 104         return osName;
 105     }
 106 
 107     public static int createReloca() {
 108         switch (arch) {
 109             case ELF.EM_X64_64:
 110                 return 1;
 111             default:
 112                 return 0;
 113         }
 114     }
 115 
 116     public static int sizeOfSymtabEntry() {
 117         return JNILibELFAPI.size_of_Sym(elfClass);
 118     }
 119 
 120     public static int sizeOfRelocEntry() {
 121         if (createReloca() == 1) {
 122             return JNILibELFAPI.size_of_Rela(elfClass);
 123         } else {
 124             return JNILibELFAPI.size_of_Rel(elfClass);
 125         }
 126     }
 127 }